Malicious PDF — malware analysis report

Static analysis result for SHA-256 397f4a136bb5c6da…

MALICIOUS

PDF

81.3 KB Created: 2021-04-14 22:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4276c8b78376b5cd9e639dcbda34e491 SHA-1: d2331524d6f53f38e1d52d367281322f6ccdfcf0 SHA-256: 397f4a136bb5c6da9f17b70a9d8c59e0c46b9b75c5f02933d458b27d7a13ec78
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a large number of external links, suggesting it functions as a link farm or a lure to potentially malicious websites. The presence of multiple distinct hosts and the use of UTM parameters in one URL point towards an attempt to redirect users to external resources, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://zajinet.ru/strik?utm_term=does+the+george+foreman+grill+really+reduce+fat
    • http://natbeach.space/22884058046h6pqi.pdf
    • https://fafevidelaxikez.weebly.com/uploads/1/3/4/4/134481631/vabogolir-negubegefisiweg.pdf
    • https://nobakavukip.weebly.com/uploads/1/3/4/3/134373074/wazaxijor.pdf
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/1741145.pdf
    • http://tixshopclub.space/96814547242allhb.pdf
    • http://kopumiwabetare.66ghz.com/61509064514.pdf
    • https://nulasexojexof.weebly.com/uploads/1/3/4/0/134012614/feledut.pdf
    • http://tujugataro.22web.org/93478894567.pdf
    • https://naxovemunozi.weebly.com/uploads/1/3/5/9/135958864/8917656.pdf
    • http://verifybadgesbusiness.com/anime_face_maker_go_free_apk52x58.pdf
    • http://geekcods.com/its_kind_of_a_funny_story_imdb_rating6m6jq.pdf
    • https://gagezomelebagam.weebly.com/uploads/1/3/1/6/131606069/419ee6.pdf
    • http://vogeposekuxav.66ghz.com/tivus.pdf
    • https://zurirepazigotot.weebly.com/uploads/1/3/0/9/130969164/nenepijepef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ded05c8b-f0d8-42bc-a64b-daa0b63394ca.filesusr.com/ugd/99afdc_6039ca6ea70f4109857dc6681001b693.pdf?index=true
    • http://mivuzovi.epizy.com/biotic_and_abiotic_interactions.pdf
    • https://b47237a6-1880-4d87-9598-f01162bab054.filesusr.com/ugd/1fe0ea_cfcac830cd28478cb9a72f018b75b571.pdf?index=true
    • http://patenat.epizy.com/java_version_1._8._0_144.pdf
    • https://af8e4364-7f8a-45ec-af3e-d69da1c27fbb.filesusr.com/ugd/12c36c_fcaeaa931cf547448ef9ccbe3b330504.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000feb6.bin
906855157f97df49c5cbd882e0e90309bade9769f974010667b4583f8aa9683e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB6 5536 bytes
font_01_sfnt_off00011170.bin
a4cb94885d88d7208b3e67da9f710452f10f01ee520d99831e709a68b0c991d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11170 11264 bytes

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